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Home/ Questions/Q 959983
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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T01:06:35+00:00 2026-05-16T01:06:35+00:00

Why would myString.Contains( ) or myString.IndexOf(‘ ‘) throw a FormatException Invalid name format? This

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Why would myString.Contains(" ") or myString.IndexOf(' ') throw a FormatException “Invalid name format”? This exception is only thrown when there is a space in myString.

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  1. Editorial Team
    Editorial Team
    2026-05-16T01:06:36+00:00Added an answer on May 16, 2026 at 1:06 am

    Looking at the MSDN pages for the string.Contains and string.IndexOf methods clearly shows that neither of these methods ever throws a FormatException.

    I can only conclude that it must be another part of the code (possibly a call to string.Format?) throwing this exception. Perhaps posting the relevant section of code would help?

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